java-design-patterns/observer/src/main/java/com/iluwatar/App.java

package com.iluwatar;

/**
 * 
 * Observer pattern defines one-to-many relationship between objects. The target
 * object sends change notifications to its registered observers.
 * 
 */
public class App {

	public static void main(String[] args) {

		Weather weather = new Weather();
		weather.addObserver(new Orcs());
		weather.addObserver(new Hobbits());

		weather.timePasses();
		weather.timePasses();
		weather.timePasses();
		weather.timePasses();

	}
}